尝试从 android 应用中的 RSS 提要中提取并播放 mp3 文件

Question

我正在尝试为播客制作一个应用程序。我的最终目标是让用户能够单击列表中的剧集（从 RSS 提要生成）然后播放音频（也是从 RSS 提要中检索的）我的问题是解析 XML 来自 RSS 提要。我似乎无法弄清楚如何从 mp3 的附件标签中取出 URL。任何帮助，将不胜感激。这是我的解析 class

private String data;
private ArrayList<Episodes> mEpisodes;

public ParseEpisodes(String xmlData) {
    this.data = xmlData;
    mEpisodes = new ArrayList<>();
}

public ArrayList<Episodes> getEpisodes() {
    return mEpisodes;
}

public boolean process(){
    boolean status = true;
    Episodes currentRecord = null;
    boolean inEntry = false;
    String textValue = "";
    String urlValue = "";

    try{
        XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
        factory.setNamespaceAware(true);
        XmlPullParser xpp = factory.newPullParser();
        xpp.setInput(new StringReader(this.data));
        int eventType = xpp.getEventType();

        while(eventType != XmlPullParser.END_DOCUMENT){
            String tagName = xpp.getName();
            switch(eventType){
                case XmlPullParser.START_TAG:
                   //Log.d("ParseEpisodes", "Starting tag for " + tagName);
                   if(tagName.equalsIgnoreCase("item")){
                       inEntry = true;
                       currentRecord = new Episodes();
                   }
                    break;

                case XmlPullParser.TEXT:
                    textValue = xpp.getText();
                    urlValue = xpp.getText();
                    break;


                case XmlPullParser.END_TAG:
                    //Log.d("ParseEpisodes", "Ending tag for " + tagName);
                    if(inEntry){
                        if(tagName.equalsIgnoreCase("item")){
                            mEpisodes.add(currentRecord);
                            inEntry = false;
                        }else if(tagName.equalsIgnoreCase("title")){
                            currentRecord.setTitle(textValue);
                        }else if(tagName.equalsIgnoreCase("enclosure")){
                            currentRecord.setLink(urlValue);
                        }

                    }
                    break;
            }
            eventType = xpp.next();
        }

    }catch (Exception e){
        status = false;
        e.printStackTrace();
    }


    return true;

}

这里是 xml

<item>
    <title>Episode 52 - Facebook Nukes The Show</title>
    <link>https://greynoi.se/podcasts/episode-52-facebook-nukes-the-show</link>    
    <enclosure url="http://greynoi.se/episodes/ep79_m.mp3" length="43312404" type="audio/mpeg"/>
    <pubDate>Fri, 15 Jul 2016 15:22:24 -0700</pubDate>
    <category>1</category>
    <source url="https://greynoi.se">The GR3YNOISE Podcast</source>
    <itunes:subtitle>Episode 52 - Facebook Nukes The Show</itunes:subtitle>
    <itunes:summary>Episode 52 - Facebook Nukes The Show</itunes:summary>
    <content:encoded><![CDATA[Episode 52 - Facebook Nukes The Show"}]]></content:encoded>
    <guid>https://greynoi.se/podcasts/episode-52-facebook-nukes-the-show</guid> 
</item>

Answer 1

所以您想要 url 在附件 url= 标记之后？

如果是这样就很容易了。只需使用子字符串查找并获取 url.

像这样的东西应该有用。

       int urlTagStart = text.indexOf("<enclosure url="");
       int urlTagEnd = text.indexOf(".mp3");
       String url = text.substring(urlTagStart + 16, urlTagEnd + 4)

Answer 2

试试这个：

...
YOUR CODE
...

while(eventType != XmlPullParser.END_DOCUMENT){
    String tagName = xpp.getName();
    if (tagName.equalsIgnoreCase("enclosure")) {
        int attributeCount = xpp.getAttributeCount();
        for(int i = 0; i<attributeCount; i++){
            String attrib = xpp.getAttributeName(i);
            if(attrib && attrib.equalsIgnoreCase("url")){    
                String url = xpp.getAttributeValue(i);
            }
         }
     }
     if (url != null && !url.isEmpty() && !url.equals("null")) {
         Log.d("ParseEpisodes", "URL to mp3: " + url);
     }

...
THE REST OF YOUR CODE
...
}

Answer 3

这个问题的解决方案非常简单。我需要做的就是删除

urlValue = xpp.getText();

来自

case XmlPullParser.TEXT:

然后改变

else if(tagName.equalsIgnoreCase("enclosure")){
         urlValue = xpp.getAttributeValue(0);
         currentRecord.setLink(urlValue);
}

在

case XmlPullParser.END_TAG:

尝试从 android 应用中的 RSS 提要中提取并播放 mp3 文件

Trying to pull and play an mp3 file from RSS feed in android app

android

xml

url

rss

mp3